code: def fork(
      self,
      __default: Pattern
      | dict[filterlib.Filter, Pattern]
      | Missing = MISSING,
      **patterns: Pattern,
  ) -> tuple[dict[str, RngStream], dict[str, RngStream]]:
      ...
  
imports: from __future__ import annotations
  import dataclasses
  import hashlib
  import typing
  import jax
  import numpy
  from flax.experimental.nnx.nnx import errors, filterlib, tracers
label_desc: Use image node_id 14 for calling the Rngs obj's underlying member method code with example usage: obj.fork(__default) without return types